When Is The Fall Equinox 2025. I f you are in the eastern time zone, then fall officially begins at 8:43 a.m., local time. At a precise moment each september, usually on the 22nd or 23rd, the sun is directly above the equator, marking the autumnal equinox in the northern hemisphere.
At a precise moment each september, usually on the 22nd or 23rd, the sun is directly above the equator, marking the autumnal equinox in the northern hemisphere. Twice a year, around march 20 or 21 and sept.